Find the correct answer with this convenient pocket calculator that is ideal for everyday math. Dual solar / battery power provides reliable functionality in any lighting conditions. The 12-digit LCD display handles large calculations. Recall saved numbers with the three memory buttons. Tax Calculation, Square Root, +/- Switch, & Percent keys help to find the answer to more equations. Protective wallet case adheres easily to the calculator & flips out of the way when in use. Power Source(s): Battery; Solar; Display Notation: Numeric; Number of Display Digits: 12; Display Characters x Display Lines: 12 x 1.